Most Active Galactic Nuclei Are at Large Distances from Us;

question 44

Multiple Choice

Most active galactic nuclei are at large distances from us; relatively few nearby galaxies harbor active galactic nuclei. What does this imply?

• A)Active galactic nuclei can form only at large distances from the Milky Way.
• B)Massive black holes existed only when the universe was young and no longer exist today.
• C)Active galactic nuclei tend to become less active as they age.
• D)The jets seen in many active galactic nuclei must cause them to move far away from us.

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Definitions:

Covariances

A measure of how two securities move in relation to each other, indicating the degree to which their returns are interconnected.

Investments

The act of allocating resources, usually money, with the expectation of generating an income or profit.

Single Index Model

A simplified financial model that describes the return of a security as a linear function of the return of a single market index, plus some random noise.

Portfolio

A diverse collection of investments held by an individual or institution, including stocks, bonds, real estate, or other financial assets, designed to reduce risk and achieve specific financial goals.